Screw-wrench.



No. 855,714. BATBNTED JUNE 4, 1907.

W. H. LITZENBERGEB. & L. A. TORNQUIST.-

SCREW WRENCH. APPLICATION FILED'JUNE 4, 1906.

. W1 TNESSFLSJ- W M UNITED STATES PATENT oEEIoE.

WILLIAM H. LITZENBERGER AND LUDVIG A. TORNQUIST, OF NEW WINDSOR, ILLINOIS.

SCREW-WRENCH.

Specification of Letters Patent.

' Patented June 4, 1907.

Application filed June 4, 1906. Serial No. 320,199.

To all whmn it may concern:

Be it known that we, WILLIAM H. LITZEN- BERGER and LUDVIG A. TORNQUIST, both of New Windsor, in the county of Mercer and State of Illinois, have invented a new and Improved Screwl/Vrench and we hereby declare that the following is a full, clear, and ex act description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 is a perspective view of our inven-.

tion in its closed position, Fig. 2 is a perspective view of the movable jaw, Fig. 3 a similar view of the shank, and Fig. 4 is a detail view of the adjustable pivot, with its lever arm and terminal lugs.

Similar letters of reference indicate corresponding parts in all the figures.

This invention has for its object the production of a simple, strong and eflicient wrench, which is specially adapted to applying calks to Neverslip horse shoes. This variety of shoe receives a plurality of stud-bolts withinthreaded apertures in the bottom of the shoe, the projecting heads of the bolts constituting the calks. These calks are somewhat tapered and conical in form, and the forms of wrenches heretofore employed in setting the calks have been open to objection, as there was no provision to avoid the lateral thrust occasioned by the tapered surface of the work to be operated upon, and because of this defect, the jaws of ordinary wrenches were pushed to one side as pressure was exerted upon the tool, rendering the work inoperative or unsatisfactory In our improved wrench this defect is obviated by means of a broad collar or hood rigidly secured to the movable jaw of the Wrench and extending a considerable distance along the immovable jaw or shank of said wrench, when the tool is in an approximately closed position, or a position adapted to the reception of work between the wrench jaws. An adjustable and removable through the middle part of the hood or collar holds the two jaws in constant alinement.

Our improved wrench consists of a straight shank member D curved at its distal extremity and provided in' said curved portion with a series of teeth L, and pierced with a plurality of pivot holes G, each pivot hole being pivot passing provided with a pair of oppositely disposed slots H for the admission of the lugs N on the adjustable pivot O. Shallow indentations O provide seats for the catchP on the lever arm of the adjustable pivot when in its proper position as will be hereinafter more fully explained.

The wrench consists further of the movable jaw A, which is seated within a broad metallic hood or collar B, which is of U shaped cross-section and rigidly secured to said jaw which it receives within its longitudinal opening, and when the wrench-is assembled, the collar B rigidly secured to the jaw member A, is pivotally attached to the shank member D, by a pivot O passing through round apertures S in both sides of the collar, said apertures being slotted at T to admit the lugs N on the adjustable pivot, which pivot acts as a fulcrum upon which the leverage is exerted when the said wrench is in use or when it is released from the work by pressure upon the thumb piece K as will be hereinafter more fully explained. The flat steel spring E attached to the movable jaw at F tends to hold the elements of the wrench in their closed position, said wrench being released from the work by pressure upon the thumb piece K.

L represents the convex jaw surface of the shank, and M the concave surface on the movable jaw, both of which surfaces are furnished with serrated teeth.

If it is desired to grasp a relatively small object with my improved wrench, the pivot holes in the collar are brought into alinement with that pivot hole in the shank nearest to the curved jaw, the lever arm R of the adjustable pivot is extended at right angles to the shank, thereby bringing the lugs N on the pivot O in alinement with the slots T and H in collar and shank respectively, when the pivot may be passed through collar and shank, the lever arm being then brought into a position parallel to the shank, the catch P may be brought into its seat in one of the indentations O. The jaws of the wrench are then opened by pressure upon the thumb piece K and said wrench placed upon the work, which it is adapted to turn in a counter-clockwise direction when in the position shown in the drawings. When reversed by placing the opposite side of the wrench adj a- 7 cent to the Work, said work may be turned in a clockwise direction.

If it is desired to seize an object relatively large, the adjustable pivot is passed through a hole in the shank farther removed from the jaws, the manner of attachment being the same as described above. Pressure upon the thumb piece K is exerted for the purpose of releasing the bolt or other object operated upon. The jaws are actuated to grasp the work by the pressure from the spring E.

We are fully aware that wrenches of somewhat similar construction aside from the hood feature of our invention have been in use especially in the case of the Hollen and Pierce wrench, secured by Letters Patent in certificate 34,498, and the Porter wrench, certificate 291,934 neither of which present the means for rigid and constant alinement of the wrench members afforded by our broad collar or hood with its central pivotal attachment to the wrench shank as will be seen by a comparison of the wrenches in question with our invention.

Having thus fully described our invention, what we claim and desire to secure by Letters Patent is:

A ratchet wrench with two jaws, a pivot connection between the jaws, an adjustable pivot provided with terminal lugs and a lever arm, a plurality of pivot holes in the wrench shank, said holes provided with oppositely disposed slots adapted to receive the lugs on the adjustable pivot, a plurality of shallow indented depressions on the shank adapted to provide seats for the catch on the lever arm of the adjustable pivot when in its various positions, and means for preventing any lateral movement of the jaws, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

WILLIAM H. LITZENBERGER. LUDVIG A. TQRNQUIST.

Witnesses:

W. R. TRACY, Jr., C. N. GIBsoN. 

